/***************************************************************************
 * Copyright 2012-2013 TXT e-solutions SpA
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * This work was performed within the IoT_at_Work Project
 * and partially funded by the European Commission's
 * 7th Framework Programme under the contract ICT-257367.
 *
 * Authors:
 *      Salvatore Piccione (TXT e-solutions SpA)
 *
 * Contributors:
 *        Domenico Rotondi (TXT e-solutions SpA)
 **************************************************************************/
package it.txt.ens.core.util.converter;

import java.util.Dictionary;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Set;

/**
 * @author Salvatore Piccione (TXT e-solutions SpA - salvatore.piccione AT txtgroup.com)
 * @author Domenico Rotondi (TXT e-solutions SpA - domenico.rotondi AT txtgroup.com)
 *
 */
public class DictionaryCloner {

    public static final Dictionary<String, Object> clone (Dictionary<String, ?> properties, Set<String> excludedKeys) {
        Hashtable<String, Object> clonedProperties = new Hashtable<String, Object>(properties.size());
        Enumeration<String> keys = properties.keys();
        String key;
        while (keys.hasMoreElements()) {
            key = keys.nextElement();
            if (null != excludedKeys) {
                if (excludedKeys.contains(key))
                    continue;
            }
            clonedProperties.put(key, properties.get(key));
        }
        return clonedProperties;
    }
}
